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Water will clean carpets but not very well. For the best results don't put any cleanser in your machine. Soap can clogged up the lines in your machine. When you have soap dispensed or or in the water in your machine you are squirting it onto the carpet and sucking it back up at the same time...the soap and water isn't on the carpet long enough to clean well unless you keep going over the same area many times. To clean better it's really important to vacuum thoroughly going slowly in multiple directions to get as much dry, gritty soil and hair and dust out as possible, it's easy to get these soils out when the carpet is dry if your vacuum is working properly. Vacuum, vacuum, vacuum.
Get a spray bottle or sprayer and put hot tap water in it, add the cleaning solution to the hot water and spray enough on the carpets to get the face fibers damp...let the hot water solution sit on the carpets 5 or 10 minutes and then use your machine to clean and rinse the soap, water and loosened soils from the carpet fibers. Repeat if necessary. Your carpets will be cleaner because you allowed adequate dwell time for the soap and water to work on the sticky greasy soils attached to the carpet fibers and stay clean longer because the soap is rinsed out of the carpets. Your carpet cleaning machine will last longer too because the water lines, pumps, spray jets, heaters, etc can't get clogged with soap gunk if you don't put soap in it. The method I'm describing is how the best professional carpet cleaners clean carpets. Hiring a quality carpet cleaner cost more up front but the carpets may stay clean two or three times longer, saving a lot of money in the long run. If you clean your carpets using this dual process method you may do a better job with a small portable home or rented cleaner than hiring the average carpet cleaning professional who is trying to give you the lowest price.

A good place to start is the owner's manual. If you don't have one, you can google the make and model of your multi-vac to get another copy.

Most wet-vacs work off the same principle. Pre-vacuum the carpet to make sure there is not normal surface dirt and dust. Next Squirt on hot soapy water, scrub it in - then suck up the dirt and collect the dirty water.

So after vacuuming the area to be wet-vacuumed and you are lucky enough to have a separate reservoir on the wet-vac unit - add pre-mixed carpet cleaner into hot tap water (with carpet cleaner mixed into it by the ratios described on the carpet cleaner soap bottle) to the multi-vac water reservoir (from a quick look, the Delonghi doesn't have one) . With the settings for wet vac (per the owners manual), squeeze the trigger for applying the carpet cleaner. Typically, you will go slower than normal vacuuming. Give it a chance to soak in and dissolve/lift the grim and dirt. Come back slowly to pull the dirty water out of the carpet.

There are multi-wet vacs (like the M31) that don't have a reservoir for the carpet cleaner. In that case, you need to pre-mix a couple of gallons of carpet clean in a separate container or bucket. Next spray or sprinkle carpet cleaner onto/into the carpet. Try to scrub the cleaner into the carpet to really get at the dirt and lift it. Next is to vacuum up the wet stuff.

Some carpet cleaners do not contain an anti-foaming agent. I recommend you either add an anti-foaming agent or buy a carpet clean product that already contains it - otherwise, it tends to be a big mess that takes a lot more time.

Sounds like you need to clean the filters. The recommendation is to clean the filters after each use. Check you User's Guide for locations. Contact Consumer Care at 1-800-237-7691 if you don't have a Guide or need more answers.

You may want to check to see if the removable nozzle is correctly placed into its place. This is the plastic part where the water is sucked up through by the carpet cleaner. The nozzle notches must fit into the groove on the cleaner correctly and the metal bar need to snap back on top of the removable nozzle, Also sometimes if you have hair trapped in the nozzle or the bristle, it will affect the suction power of getting up the dirty water. The dirty water tank need to snap in place by making sure the top of the gray snaps on each side is over the top groove of the dirty tank on each side and the the gray snaps are pushed down and pushed into the tank to until it is snapped in place.Super Simple answer could be: The Dirty water tank could have bubbles in it causing it not to **** too.

The hose or nozzle could be plugged. The hose can be disconnected at the machine end there is a clip on the bottom of the connection. The fluid is dispensed by a pump which could be bad. If you disconnect the hose and put a rag at the opening to catch the fluid, then turn the machine on briefly the fluid should squirt out if the pump is working.

Does water squirt out of the hose nozzle, if it does, then check the heater inside the handle asm. Make sure that where the tubes hook up to it are not clogged. If water doesn't squirt, check for the seal at the bottom of the tank, it needs to be on the tank, not in the hole, this is for the soap bottle also, there is a seal on the bottom of it as well. The flow indictor cap is leaking air or maybe is too tight. If you had the top cover off, make sure that the tubes are routed right so as not to get pinched when the cover is put back on, the smart mix knob should be in the water setting and that the piston is on the bottom of the smart mix knob. Pump is bad. Try running a mix of vinegar and water to see if that unclogs the lines. Is the top cover and the base tight together in the back, sometimes the top breaks loose and it will raise up and it can't spray, just re-fasten it down.